Add link to firewall requirements

Author: alkohli

azure-stack/hci/whats-new.md

@@ -32,7 +32,7 @@ This is primarily a bug fix release with a few improvements.
   - You can now view and delete VM network interfaces from the Azure portal.
   - You can view **Connected devices** for logical networks. In the Azure portal, you can go to the logical network and then go to **Settings > Connected devices** to view the connected devices.
   - Deletion of logical networks is blocked if connected devices are present. When you try to delete a logical network from the Azure portal that has connected devices, you'll see a warning message: *Cannot delete logical network because it is currently in use*. Delete all the resources under **Connected Devices** setting before you delete the logical network.
-  - From this release onwards, a new URL needs to be added to the allowlist for `stack-hci-vm` Azure CLI installation. The URL has changed from: `https://hciarcvmsstorage.blob.core.windows.net/cli-extension/stack_hci_vm-{version}-py3-none-any.whl` to: `https://hciarcvmsstorage.z13.web.core.windows.net/cli-extensions/stack_hci_vm-{version}-py3-none-any.whl`.
+  - From this release onwards, a new URL needs to be added to the allowlist for `stack-hci-vm` Azure CLI installation. The URL has changed from: `https://hciarcvmsstorage.blob.core.windows.net/cli-extension/stack_hci_vm-{version}-py3-none-any.whl` to: `https://hciarcvmsstorage.z13.web.core.windows.net/cli-extensions/stack_hci_vm-{version}-py3-none-any.whl`. For more information, see [Azure Stack HCI firewall requirements](./concepts/firewall-requirements.md).
 
 - **Update health checks**: Starting this release, a new health check was added and the update service was improved. Additionally, the update service now supports the ability to view or start new updates when the service crashes on servers. Also, multiple issues for health checks related to Azure Update Manager and Solution Builder Extension Update were fixed.